{"product_id":"green-planet-pro-cal","title":"Green Planet Pro-Cal","description":"\u003ch2\u003eCorrect calcium and magnesium shortfalls before they cost you a harvest\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eGreenPlanet Pro-Cal\u003c\/strong\u003e is a \u003cstrong\u003ecalcium, magnesium and iron supplement\u003c\/strong\u003e that prevents and corrects the deficiencies that show up most often in \u003cstrong\u003ecoco coir, and on reverse osmosis or rainwater\u003c\/strong\u003e, where calcium and magnesium sit too low for healthy development. It is designed to run alongside any nutrient programme, mineral or organic, from early growth right through to the week before harvest.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcium, magnesium and iron together\u003c\/strong\u003e - the three elements that go short first on soft water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt for coco\u003c\/strong\u003e - GreenPlanet specifically recommend it wherever coco substrates are used\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks with any base feed\u003c\/strong\u003e - it is a supplement, not a competing base nutrient\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlso re-buffers a coco substrate\u003c\/strong\u003e - at a higher rate, with a reduced-strength nutrient solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRuns the whole cycle\u003c\/strong\u003e - vegetative growth and flowering, stopping a week before harvest\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eInterveinal yellowing, weak stems and blossom-end problems\u003c\/h3\u003e\u003cp\u003eCoco coir holds on to calcium and magnesium and releases them slowly, and reverse osmosis water carries almost none to begin with. The result is a plant that looks well fed but shows \u003cstrong\u003eyellowing between the leaf veins\u003c\/strong\u003e, soft growth and poor flower set. Adding calcium and magnesium as a dedicated supplement fixes the shortfall without forcing the rest of the feed up.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith any nutrient programme:\u003c\/strong\u003e \u003cstrong\u003e1.25 mL per litre\u003c\/strong\u003e, until one week before harvest\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoco growers:\u003c\/strong\u003e GreenPlanet recommend Pro-Cal on all coco substrates at this rate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRe-buffering a coco substrate:\u003c\/strong\u003e a one-third strength nutrient solution with Pro-Cal at \u003cstrong\u003e2 mL per litre\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH:\u003c\/strong\u003e hold the nutrient solution between \u003cstrong\u003e5.8 and 6.3\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolution temperature:\u003c\/strong\u003e keep between \u003cstrong\u003e18 and 22°C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"hcs-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRole:\u003c\/strong\u003e Calcium, magnesium and iron supplement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTypical dose:\u003c\/strong\u003e 1.25 mL per litre\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoco re-buffering dose:\u003c\/strong\u003e 2 mL per litre with a one-third strength solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWindow:\u003c\/strong\u003e Whole cycle, stopping one week before harvest\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBest suited to:\u003c\/strong\u003e Coco coir, reverse osmosis and rainwater\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia:\u003c\/strong\u003e Soil, coco, hydroponics\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH range:\u003c\/strong\u003e 5.8 to 6.3\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"hcs-dosing\" style=\"margin:32px 0 0;border:1px solid #e6e6e6;border-radius:12px;overflow:hidden;font-family:Montserrat,-apple-system,'Segoe UI',sans-serif;\"\u003e\n\u003cdiv style=\"background:#101010;padding:16px 20px;border-bottom:3px solid #efc04c;\"\u003e\n\u003cdiv style=\"color:#ffffff;font-size:17px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;\"\u003eFeed Chart\u003c\/div\u003e\n\u003cdiv style=\"margin-top:6px;color:#b8b8b8;font-size:12px;line-height:1.5;\"\u003eGreen Planet Pro-Cal · hydroponics, coco and soil\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;color:#2b2b2b;background:#fff;\"\u003e\n\u003ctr style=\"background:#f4f4f4;\"\u003e\n\u003cth style=\"text-align:left;padding:10px 20px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#6b6b6b;font-weight:600;\"\u003eStage\u003c\/th\u003e\n\u003cth style=\"text-align:right;padding:10px 14px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#6b6b6b;font-weight:600;white-space:nowrap;\"\u003ePer 1 L\u003c\/th\u003e\n\u003cth style=\"text-align:right;padding:10px 20px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#6b6b6b;font-weight:600;white-space:nowrap;\"\u003ePer 10 L\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;\"\u003eWith any nutrient programme, until one week before harvest\u003c\/td\u003e\n\u003ctd style=\"padding:12px 14px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;font-weight:600;\"\u003e1.25 ml\u003c\/td\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;color:#6b6b6b;\"\u003e12.5 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fcfaf4;\"\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;\"\u003eRe-buffering a coco substrate (with a one-third strength nutrient solution)\u003c\/td\u003e\n\u003ctd style=\"padding:12px 14px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;font-weight:600;\"\u003e2 ml\u003c\/td\u003e\n\u003ctd style=\"padding:12px 20px;border-top:1px solid #ededed;text-align:right;white-space:nowrap;color:#6b6b6b;\"\u003e20 ml\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"background:#101010;padding:12px 20px;font-size:12px;color:#b8b8b8;line-height:1.6;\"\u003e\n\u003cspan style=\"color:#efc04c;font-weight:600;\"\u003eNote\u003c\/span\u003e — GreenPlanet publish both rates as millilitres per litre of water, and specifically recommend Pro-Cal on coco substrates at 1.25 mL\/L. Hold the nutrient solution at pH 5.8 – 6.3 and 18 – 22°C. Their EC targets are calculated on RO water, so tap water raises the stated EC. Check pH and EC after mixing.\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Green Planet","offers":[{"title":"1L","offer_id":53500732768522,"sku":null,"price":11.49,"currency_code":"GBP","in_stock":true},{"title":"4L","offer_id":53500732801290,"sku":null,"price":40.9,"currency_code":"GBP","in_stock":true},{"title":"10L","offer_id":53500732834058,"sku":null,"price":86.9,"currency_code":"GBP","in_stock":true},{"title":"23L","offer_id":53500732866826,"sku":null,"price":113.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/GREEN-PLANET-PRO-CAL-GROUP.jpg?v=1786377766","url":"https:\/\/hydrocropshop.co.uk\/products\/green-planet-pro-cal","provider":"Hydro Crop Shop","version":"1.0","type":"link"}